Macroscopic quantum tunneling and dissipation in c-axis twist Josephson junctions

被引：3
|
作者：
Kawabata, S
Asano, Y
Kashiwaya, S
Tanaka, Y
机构：
[1] Natl Inst Adv Ind Sci & Technol, Nanotechnol Res Inst, Tsukuba, Ibaraki 3058568, Japan
[2] Natl Inst Adv Ind Sci & Technol, Res Consortium Synthet Nanofunct Mat Project, Tsukuba, Ibaraki 3058568, Japan
[3] Hokkaido Univ, Fac Engn, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan
[4] Agcy Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki 3058568, Japan
[5] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2006年 / 67卷 / 1-3期
关键词：
nanostructures; superconductors; thin films; super conductivity; transport properties;
D O I：
10.1016/j.jpcs.2005.10.110
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We study macroscopic quantum tunneling (MQT) in c-axis twist superconductor Josephson junctions. By using the functional integral method and the instanton theory we have obtained the analytical expression of the MQT rate (the inverse lifetime of the metastable state). In the case of the zero twist angle, we find that the system shows the super-Ohmic dissipation due to the presence of the nodal quasiparticle tunneling. Therefore, the MQT rate is strongly suppressed in compared with the finite twist angle cases. (c) 2005 Elsevier Ltd. All rights reserved.
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页码：120 / 122
页数：3
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